I've bought a domain from godaddy (no webhosting), and want to buy another domain with the same name, just a different tld (ones .de, the other .com).
Is it possible to host on only one provider, but have both .de and .com lead to the same page.
Yes you can do this.
From the cpannel you will click on addon domain and will add the seocnd domain there and then will set the location for the files of website then at that location on server you can place your second site